Einstein's
theory of special relativity includes electricity and magnetism in a simple, logical
extension of the relativity of Galileo and Newton. Its conclusions, including
time dilation, length contraction, and E=mc2 have changed profoundly
our ideas of time and space, matter and energy.

These
multimedia modules (click on menu above right) give a brief
overview of relativity - they present the main ideas. Inevitably,
you will have questions. So the related links (below) give more complete
explanations, at levels with ()
or without mathematics ().

Animations from Einstein Light require the Flash
6 Plugin. The multimedia modules have animations and film clips
and are typically 2Mb. The much smaller HTML versions have only
text and images. (If your connection is slow, you might read some
of the background links while the modules load.)